Python

[tuxius]

Hi,

I am trying to get the Raspberry Pi 7'' touchscreen to run with Python. After googling through the web I started using PyGame as a library to display and get touch events. The displaying part works great, but I struggle with the touch events. The coordinates I get back are totaly off, often the bottom right of the screen no matter where I touch. Here is a sample code to demonstrate the problem:

Code: Select all

import pygame
from pygame.locals import *
import os
from time import *

# Init the screen and everything else
os.putenv('SDL_VIDEODRIVER', 'fbcon')
os.putenv('SDL_FBDEV'      , '/dev/fb1')
os.putenv('SDL_MOUSEDRV'   , 'TSLIB')
os.putenv('SDL_MOUSEDEV'   , '/dev/input/touchscreen')
pygame.init()
pygame.mouse.set_visible(False)
screen = pygame.display.set_mode((800,480),pygame.FULLSCREEN)
screen.fill((0,0,0))
pygame.display.update()
pygame.event.clear()

# Let's just draw a filled rectangle to proof init and pygame worked
# Parameters are the color (255,100,0) and the position (300,160) and size (200,160)
# Result is a orange rectangle in the middle of the screen
pygame.draw.rect(screen, (255,100,0), (300,160,200,160), 0)

# If the display gets touched write of the position to the console for the next 10 seconds
i=0
while i<100:
	for event in pygame.event.get():
		if(event.type is MOUSEBUTTONUP):
			pos = pygame.mouse.get_pos()
			print "UP: " + str(pos[0]) + ":" + str(pos[1])
		elif(event.type is MOUSEBUTTONDOWN):
			pos = pygame.mouse.get_pos()			
			print "DOWN: " + str(pos[0]) + ":" + str(pos[1])

	pygame.event.clear()
	pygame.display.update()
	sleep(0.1)
	i=i+1

Running this gives me the following output while touching the screen randomly all over the place:

Code: Select all

DOWN:   670:435
DOWN:   799:479
UP:   799:479
DOWN:   799:479
UP:   799:479
DOWN:   799:479
UP:   799:479
DOWN:   799:479
UP:   799:479
DOWN:  799:479
UP:   799:479
DOWN:   799:479
UP:   799:479
...

This is not what I expected as I touched the Display all over the place. Anyone got an idea how to fix this? My wild guess is that it has something to do with the init part / using the right "Driver"?

Code: Select all

os.putenv('SDL_VIDEODRIVER', 'fbcon')
os.putenv('SDL_FBDEV'      , '/dev/fb1')
os.putenv('SDL_MOUSEDRV'   , 'TSLIB')
os.putenv('SDL_MOUSEDEV'   , '/dev/input/touchscreen')

Best
Tuxius

[kdbdallas]

I am running into this same issue, did you ever figure it out?

[tuxius]

Hi kdbdallas,

so far I have not found a solution, nor did anybody respond besides you

I would like to appeal to the programmer's kudos - can anyone help?

Best
Tuxius

[DougieLawson]

Try using Kivy. There's some good sample programs for Kivy with the touchscreen.

viewtopic.php?t=121013
viewtopic.php?t=121392

[texy]

Try using Kivy. There's some good sample programs for Kivy with the touchscreen.

viewtopic.php?t=121013
viewtopic.php?t=121392

That's not what the OP is asking for.....

However a couple of possibilities - ts_calibrate may work (I haven't tried it) :

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sudo TSLIB_FBDEVICE=/dev/fb1 TSLIB_TSDEVICE=/dev/input/event0 ts_calibrate

the event0 may need to be event1 or another number depending on the number of input devise you have connected.
Also overscan may be a cause, see this thread :
viewtopic.php?f=108&t=121781

Texy